I use 7 footers which are arched near the top, they really take some of the steepness out! I also have a short box Z-71 and i really like them. They are a galvanized set of 2 (2 seperate single ramps) and they fold in half.They came with 2 tie downs that i hook to the bumper and then to the ramp. I can slip one under the quad folded up and the other i have to put beside the quad and i tie it off with a bungie cord. They were $159.00 up here in Canada at TSC..Irv